Dehydration of 1‐phenylethanol over solid acidic catalysts

Abstract

Dehydration of 1‐phenylethanol has been carried out over a solid acidic catalyst in order to examine the effect of the concentration of effective acid sites on the reaction rate, styrene selectivity and catalyst fouling. The reaction rate increased with the concentration of effective acid sites, while styrene selectivity decreased. The catalyst deactivation depended upon the concentration of the effective acid sites and also the size of the micro pores in the catalyst. Taking into account the reaction rate and selectivity, ALO‐4 alumina was the most suitable catalyst for the present reaction. An activation energy for the dehydration over ALO‐4 alumina was 83.8 kJ mol−1. The dehydration reaction could be a useful tool for the characterization of the nature of the acid sites.

Dehydration reactions in polyfunctional natural products

“…Prolonging the reaction time to 20 minutes at the same temperature delivers an isomeric mixture of elimination products -(6) and (7) -containing either a tri-or tetra-substituted double bond. Finally, treating the substrate alcohol (4) with boron trifluoride at 0 °C for 4 hours affords the tetrasubstituted olefin (8), a scaffold belonging to the halimane compound class, through a stereospecific [1,2]-methyl shift. 19 Mechanistically, these diverse outcomes likely follows from an initial dehydration to (5) and subsequent re-complexation of boron trifluoride with the olefin of (5) to facilitate formation of the subsequent rearrangement products.…”

An Iron-Based Dehydration Catalyst for Selective Formation of Styrene

“…Our experiment was aimed to demonstrate the potential for the chemical optimization of this process. After only 1 h of operation, common Brønsted-acidic catalysts, such as zeolites and silica-aluminas, show signs of significant deactivation. , …”

“…After only 1 h of operation, common Brønsted-acidic catalysts, such as zeolites and silica-aluminas, show signs of significant deactivation. 8,24 In contrast, A was proven to be very robust. The turnover number of 310 is high for a homogeneous iron catalyst.…”

New Synthesis of ZSM-5 from High-Silica Kaolinite and Its Use in Vapor-Phase Conversion of 1-Phenylethanol to Styrene

“…34 The effect of acid sites concentration, crystal size, and Si/Al ratio on the LD of 1phenylethanol have been investigated. 35 2. EXPERIMENTAL SECTION 2.1.…”

“…Bertero and co-workers have studied the effect of Bronsted and Lewis acid sites on the LD of 1-phenylethanol over solid acid catalysts. , They proposed two different routes for the LD of 1-phenylethanol over H-ZSM-5 that lead to the formation of styrene and α-methyl benzyl ether . The effect of acid sites concentration, crystal size, and Si/Al ratio on the LD of 1-phenylethanol have been investigated …”